To print a demo page from the Deskjet 812C (just to check printing ability or print quality) hold down the Resume button (the button below the Power button, with the arrow on it) for about five seconds. A sample page with the printer's model name and a color picture will print out shortly.
If you'd rather print out a self-test page, which is all text but gives the printer's serial number and page count, see the instructions here.
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